Journal
OPTICS EXPRESS
Volume 21, Issue 13, Pages A677-A686Publisher
OPTICAL SOC AMER
DOI: 10.1364/OE.21.00A677
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Funding
- National Natural Science Foundation of China [91233119, 61204066]
- 1000 Young Experts Plan of China
- Priority Academic Program Development (PAPD) of Jiangsu Higher Education Institutions
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A photonic crystal design that significantly enhances the absorption of tandem thin-film solar cells composed by amorphous and microcrystalline silicon (i.e., a-Si:H/mu c-Si:H tandem cell) is proposed. The top junction with a-Si:H is nanopatterned as a one-dimensional photonic crystal. Considering the photocurrent matching, we optimally design the junction thickness and the configuration of the nanopattern; moreover, both transverse electric and magnetic incidences with various illuminating angles are taken into account. Calculations by rigorous coupled-wave approach and finite-element method show that the nanophotonic crystal design can improve the absorption and output photocurrent by over 20%, which shows very low sensitivity to the incident polarization. Moreover, the proposed structure is able to sustain the performance for a very wide angle ranges from 0 degrees to similar to 80 degrees. (C) 2013 Optical Society of America
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